Q: In the reaction $$2\mathrm{Ag}(s) + \mathrm{S}(s) \rightarrow \mathrm{Ag}_2\mathrm{S}(s)$$, what is the mole–mole factor between Ag and Ag$$_2S$$?

$$2\text{ moles Ag} : 1\text{ mole Ag}_2\text{S}$$

Question 1

Which of the following best describes a combination reaction?

Accepted Answer

Two or more reactants combine to yield a single product.

Question 2

What is the balanced equation for the decomposition of mercury(II) oxide?

Accepted Answer

$$2\mathrm{HgO}(s) \rightarrow 2\mathrm{Hg}(l) + \mathrm{O}_2(g)$$

Question 3

Which reaction type is represented by the following equation: $$\mathrm{Zn}(s) + 2\mathrm{HCl}(aq) \rightarrow \mathrm{ZnCl}_2(aq) + \mathrm{H}_2(g)$$?

Accepted Answer

Single replacement

Question 4

In a combustion reaction, what are the typical products when a hydrocarbon burns in oxygen?

Accepted Answer

Carbon dioxide and water

Question 5

Which of the following is a double replacement reaction?

Accepted Answer

$$\mathrm{Na}_2\mathrm{SO}_4(aq) + \mathrm{BaCl}_2(aq) \rightarrow \mathrm{BaSO}_4(s) + 2\mathrm{NaCl}(aq)$$

Question 6

Which of the following statements about oxidation–reduction reactions is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 7

A patient exposed to carbon monoxide experiences symptoms because CO binds to hemoglobin. What is the effect of this binding?

Accepted Answer

It reduces the amount of oxygen that can reach cells.

Question 8

Which of the following is an example of a combination reaction?

Accepted Answer

$$2\mathrm{Mg}(s) + \mathrm{O}_2(g) \rightarrow 2\mathrm{MgO}(s)$$

Question 9

In the reaction $$2\mathrm{Ag}(s) + \mathrm{S}(s) \rightarrow \mathrm{Ag}_2\mathrm{S}(s)$$, what is the mole–mole factor between Ag and Ag$$_2S$$?

Accepted Answer

$$2	ext{ moles Ag} : 1	ext{ mole Ag}_2	ext{S}$$

Question 10

Which of the following is true according to the law of conservation of mass?

Accepted Answer

The mass of products is equal to the mass of reactants.

Question 11

A candle burns in air. Which type of reaction is occurring?

Accepted Answer

Combustion

Question 12

In the reaction $$\mathrm{Zn}(s) + \mathrm{Cu}^{2+}(aq) \rightarrow \mathrm{Zn}^{2+}(aq) + \mathrm{Cu}(s)$$, which element is oxidized?

Accepted Answer

Zinc

Question 13

Which of the following best describes a decomposition reaction?

Accepted Answer

A single reactant splits into two or more products.

Question 14

In biological systems, which of the following is a characteristic of reduction?

Accepted Answer

Gain of hydrogen atoms

Question 15

If 12.0 moles of sulfur react with iron according to $$2\mathrm{Fe}(s) + 3\mathrm{S}(s) \rightarrow \mathrm{Fe}_2\mathrm{S}_3(s)$$, how many moles of iron are needed?

Accepted Answer

16.0 moles of Fe

Question 16

Which of the following is a real-life consequence of incomplete combustion in a home?

Accepted Answer

Production of carbon monoxide, which is poisonous.

Question 17

In the oxidation–reduction reaction involving FAD in biological systems, what happens to FAD?

Accepted Answer

FAD is reduced by gaining hydrogen atoms.

Question 18

Which of the following is NOT a characteristic of oxidation?

Accepted Answer

Gain of hydrogen atoms

Chemical Quantities and Reactions: Types, Redox, and Mole Relationships

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